I think it depends very much on the parent(s). Whether or not you have "too many" children depends on your personality as a parent, your financial stability, your patience, your idea of how children are to be raised etc.
Very many things to take into consideration, and everyone will be different.
For me I would love to have 10 even. But on reflection, I have to take into account my own personality, my own personal career ambitions, my capacity to care for children etc. After taking all that into account, I have arrived at the magic number of 4 (or maybe 5) children.
I do always like to add at the end of these kinds of threads that it doesn't matter how many children I think I will have, all that is out of my hands as I believe how many children you have is pre-destined, so whilst I like the debate, I feel it is all very theoretical as in practice, you will have as many children as you were meant to. People who only wanted one, might end up with 7, people who wanted many, might end up with 1.
Eternal I have missed your threads!! x